WAEC Chemistry 2014 Theory — Question 19

Question 19 of 38 from the West African Examinations Council (WAEC) Chemistry 2014 Theory paper, with the correct answer and a full explanation.

2(e). A certain chip W used in a circuit of a microcomputer has a mass of 5.68mg. Calculate the amount of W in the microcomputer. [W=28gmol⁻¹]

Model answer

Mass = 5.68mg = 5.68/1000 = 0.00568g. Mole = Mass/Molar mass = 0.00568/28 = 2.03×10⁻⁴ moles.

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